Question

Which of the following is not an A.P. ? 

(a) 1 , 4 , 7 , 10 , .........

(b) 3 , 7 , 12 , 18 , ..........

(c) 11 , 14 , 17 , 20 , .........

(d) -5 , -2 , 1 , 4 , ........​

Answer 1

Answer:

(b) is not A.P

Step-by-step explanation:

becoz

in b,

t2 - t1 = 7-3 = 4

t3 - t2 = 12-7 = 5

hence t2-t1 is not equal to t3-t2

hence it is not an A.P